Ion-by-ion Cooling efficiencies

Details Ion-by-ion Cooling efficiencies Ion-by-ion Cooling efficiencies

2011-11-29

arxiv.org/abs/1111.6980v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Submitted to ApJS. Electronic data available at http://wise-obs.tau.ac.il/~orlyg/ion_by_ion/

Scientific paper

We present ion-by-ion cooling efficiencies for low-density gas. We use Cloudy (ver. 08.00) to estimate the cooling efficiencies for each ion of the first 30 elements (H-Zn) individually. We present results for gas temperatures between 1e4 and 1e8K, assuming low densities and optically thin conditions. When nonequilibrium ionization plays a significant role the ionization states deviate from those that obtain in collisional ionization equilibrium (CIE), and the local cooling efficiency at any given temperature depends on specific non-equilibrium ion fractions. The results presented here allow for an efficient estimate of the total cooling efficiency for any ionic composition. We also list the elemental cooling efficiencies assuming CIE conditions. These can be used to construct CIE cooling efficiencies for non-solar abundance ratios, or to estimate the cooling due to elements not explicitly included in any nonequilibrium computation. All the computational results are listed in convenient online tables.

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